linux-kernel - Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

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Date:	Fri, 1 Apr 2016 11:02:23 -0500
From:	David Lechner <david@...hnology.com>
To:	Bin Liu <b-liu@...com>, Kishon Vijay Abraham I <kishon@...com>,
	Petr Kulhavy <petr@...ix.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andreas Färber <afaerber@...e.de>,
	Tony Lindgren <tony@...mide.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

On 04/01/2016 09:45 AM, Bin Liu wrote:
>>> +EXPORT_SYMBOL_GPL(da8xx_usb20_phy_set_mode);
>>
>> Don't prefer export symbols from PHY driver. That'll create unnecessary
>> dependencies between the controller and the PHY.
>
> Agreed.
>
>>
>> I think it'll be better to create a new attribute and use it?
>
> Another simpler option is to not support _set_mode() for DA8xx, and the
> phy driver set the otgmode bit in probe() based on dr_mode of the
> controller.
>
> Regards,
> -Bin.
>

This certainly works for my particular use case, however, Sergei 
Shtylyov, who wrote the da8xx musb glue layer originally, seemed to 
recall in his review of the patch series that this really is necessary 
for OTG mode to work properly.

By the way, there is v3 of this patch series already, although this 
patch is nearly the same.